Light dimmer switch



FIG. 1 is a top front, and left side perspective view of a light dimmer switch showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right-side elevational view thereof; and

FIG. 6 is a left-side elevational view thereof. 

The ornamental design for a light dimmer switch, as shown and described. 